1
GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
A dc power supply has a no-load voltage of 30V, and a full-load voltage of 25 V at a full-load current of 1A. Its output resistance and load regulation, respectively are
A
5Ω and 20%
B
25Ω and 20%
C
5Ω and 16.7%
D
25Ω and 16.7%
2
GATE ECE 1999
Subjective
+5
-0
A bipolar junction transistor amplifier circuit is shown in the figure. Assume that the current source Ibias is ideal, and the transistor has very large$$\beta ,\,\,{r_{b\,\,}} = \,\,0,$$ and the $${r_0}\, \to \,\infty $$. GATE ECE 1999 Analog Circuits - Bipolar Junction Transistor Question 5 English

Determine the ac small-signal mid-band and voltage gain $$\left( {{V_o}/{V_s}} \right),$$ input resistance (R1, and output resistance (R0) of the circuit. Assume $${V_{T\,\,}} = \,\,26\,mV.$$

3
GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
An NPN transistor (with $${C_\pi }\,\, = \,\,0.3\,\,$$ pf) has a unity gain cutoff frequency $${f_T}$$ of 400 MHz at a DC-bias current Ic = 1mA. The value of its $${C_\mu }$$ (in pf) is approximately $$\left( {{V_T}\, = \,26\,mV} \right)$$.
A
15
B
30
C
50
D
96
4
GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
An amplifier is assumed to have a single pole high frequency transfer function. The rise time of its output response to a step function input is 35 nsec. The upper 3 dB frequency (in MHz) for the amplifier to a sinusoidal input is approximately at
A
4.55
B
10
C
20
D
28.6
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